How to remove CC and BCC from email notifications

Hi, my application sends email notifications when a simple form is submitted. The emails are sent to default address that is set in .env and config/mail.php

However, within every message, the recipient's email address is being used as CC and BCC. I need these two to be empty. Could you please advise how to do that?

Currently the emails are being sent from the controller like this: Mail::send(new ContactSend($contact));

Thanks!